{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5SMB43A","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5SMB43A","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5SMB43A","factsUrl":"https://icboms.com/api/mcp/products/1.5SMB43A","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. 1.5SMB Series Zener TVS, 1.5SMB43A, DO-214AA SMB, 1500W Peak Pulse, 36.8V Standoff, 76.6V Clamp, Surface Mount, Telecom.","salesMarkdown":"## 1500 W Zener TVS for telecom board protection The Littelfuse 1.5SMB43A is a single-channel unidirectional Zener TVS diode in the 1.5SMB series, designed to clamp transients on telecom line cards, base stations, and networking power rails. The reverse standoff voltage is 36.8 V, meaning the diode stays off below that level and does not load the signal line during normal operation. Breakdown starts at 40.9 V minimum, and the clamping voltage is held to 76.6 V at the rated peak current — tight enough to protect a 48 V rail downstream of a hot-swap controller or a PoE PSE. ## Package, temperature, and mounting Housed in the DO-214AA (SMB) package, surface-mount, the 1.5SMB43A sits on a standard footprint shared across the 1.5SMB family. The operating junction temperature range spans -65°C to +150°C, covering outdoor telecom cabinets and uncontrolled indoor environments without derating concerns. The tape-and-reel and cut-tape packaging options suit both prototype assembly and production reflow.","metaTitle":"1.5SMB43A Littelfuse Zener TVS, 1500W, DO-214AA","metaDescription":"1.5SMB43A Littelfuse Zener TVS diode, 1500W peak power, 36.8V standoff, 76.6V clamp. Active production. Surface mount DO-214AA. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"1.5SMB","Package":"Tape & Reel (TR); Cut Tape (CT)","Applications":"Telecom","Mounting Type":"Surface Mount","Package / Case":"DO-214AA, SMB","Product Status":"Active","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5SMB","Operating Temperature":"-65°C~150°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"DO-214AA (SMBJ)","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"40.9V","Voltage - Clamping (Max) @ Ipp":"76.6V","Voltage - Reverse Standoff (Typ)":"36.8V","Current - Peak Pulse (10/1000µs)":"140.8A (8/20µs)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.6200","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/81b90dfb07fef606df152b0bf1427329.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What package does the 1.5SMB43A use?","answer":"The DO-214AA (SMB) surface-mount package. The supplier device package is also listed as DO-214AA (SMBJ). Tape-and-reel and cut-tape options are available."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5SMB43A","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5SMB43A when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}